IN

BIAS

GND

OUT

10 PF

10 PF

1 PF

GND

GND

LP38853

ADJ

R1

R2

SS

EN

LP38853

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SNVS335E – DECEMBER 2006 – REVISED NOVEMBER 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The typical applications of the LP38853 include DSP supplies, microcontroller supplies, and post regulators.

Figure 23 shows the typical application circuit for LP38853.

8.2 Typical Application

Figure 23. LP38853 Typical Application

8.2.1 Design Requirements

For typical linear regulator applications, use the parameters listed in Table 2.

Table 2. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage

1.8 V

Output voltage

0.8 V

Output current

3 A

8.2.2 Detailed Design Procedure

8.2.2.1 External Capacitors

To assure regulator stability, input and output capacitors are required as shown in the Figure 23.

8.2.2.1.1

Input Capacitor

The input capacitor must be at least 10 µF, but can be increased without limit. Its purpose is to provide a low

source impedance for the regulator input. A ceramic capacitor, X5R or X7R, is recommended.

Tantalum capacitors may also be used at the input pin. There is no specific equivalent series resistance (ESR)

limitation on the input capacitor (the lower, the better).

Aluminum electrolytic capacitors can be used, but are not recommended as their ESR increases very quickly at

cold temperatures. They are not recommended for any application where the ambient temperature falls below

0°C.

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